def main():
    print(''.join(filter(lambda x: x.isalpha(), list(input().strip()))))

def main2():
    user_input = input().strip()
    char_list = list(user_input)
    alpha_chars = filter(lambda x: x.isalpha(), char_list)
    result = ''.join(alpha_chars)
    print(result)

if __name__ == '__main__':
    main()
